U of S | Mailing List Archive | alt-photo-process-l | Re: pt/pd stops

Re: pt/pd stops


With pure Palladium, I am getting over 10 stops—I bought a 41 step tablet because of this! 

Moisture at the time of exposure will also make a difference.
On Apr 11, 2009, at 2:26:02 PM, "etienne garbaux" <photographeur@nerdshack.com> wrote:

From:"etienne garbaux" <photographeur@nerdshack.com>
Subject:Re: pt/pd stops
Date:April 11, 2009 2:26:02 PM CDT
Chris wrote:

>Can someone tell me the greatest amount of stops they have gotten 
>with pt/pd? Or put it in terms of logs or DR, if that's how you do it.

I use the traditional formula, 100% Pt, no contrast agent, and you 
can clearly see all 31 steps of a 3.05 wedge on the very smooth, very 
white papers I favor.  That is the exposure scale, of course -- the 
print Dmax is generally 1.5 or so.  I usually make negatives with a 
DR of 3.1-3.2 for this process (which limits one's choice of films).

Best regards,


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